Ruud RD17AZ - Refrigerant Line Sizing Chart (English Units)

15
4.0 INSTALLATION
Tubing
Table 2A: Refrigerant Line Sizing Chart (English Units)
14.3/17 SEER2 Variable Speed Heat Pumps
Unit Size
Allowable
Liquid Line
Size
Allowable
Vapour
Line
Size
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Feet)
< 25 26-50 51-75 76-100 101-125 126 -150
Maximum Vertical Separation / Capacity Multiplier
2.0 Ton
*SEE
NOTE 3
1/4" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 6 / 0.97 NR NR
5/16" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8" 5/8" 25 /1.00 50 / 0.99 33 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
1/4" 3/4" * 25 /1.00 50 / 1.00 33 / 0.99 6 / 0.99 NR NR
5/16" 3/4" * 25 /1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3/8" 3/4" * 25 /1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3 Ton
5/16" 5/8" 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 36 / 0.91 NR
3/8" 5/8" 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
5/16" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 36 / 0.97 20 / 0.96
3/8" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
1/2" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
4 Ton
3/8" 3/4" 25 / 0.99 50 / 0.98 50 / 0.96 50 / 0.95 50 / 0.93 50 / 0.92
1/2" 3/4" 25 / 0.99 50 / 0.98 50 / 0.96 50 / 0.95 50 / 0.93 50 / 0.92
3/8" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
1/2" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
5 Ton
**SEE
NOTE 4
3/8" 3/4" 25 / 0.98 50 / 0.97 50 / 0.95 50 / 0.93 46 / 0.91 NR
1/2" 3/4" 25 / 0.98 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
3/8" 7/8" 25 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 38 / 0.95
1/2" 7/8" 25 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8" 1-1/8" ** 25 / 1.00 50 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 38 / 0.99
1/2" 1-1/8" ** 25 / 1.00 50 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99
Notes:
1) Do not exceed 150 ft linear line length.
2) Do not exceed 50 ft vertical separation between indoor and outdoor units.
3) * 3/4" vapour line should only be used for 2 ton systems if outdoor unit is below or at same level as indoor
unit to assure proper oil return.
4) ** 1-1/8" vapour line should only be used for 5 ton systems if outdoor unit is below or at same level as indoor
unit to assure proper oil return.
5) Always use the smallest liquid line allowable to minimize refrigerant charge.
6) Applications shaded in light Gray indicate capacity multipliers between 0.90 and 0.96 which are not
recommended, but are allowed.
7) Applications shaded in dark Gray are not recommended due to excessive liquid or suction pressure drop.